Sancho left Dortmund in 2021 to sign for the Red Devils in a £73million deal, but has since failed to replicate his form in Manchester.

He appears delighted to be back in the yellow and black of Dortmund with the club sharing some clips of him arriving at the training ground to their social media.

However, the smile-filled videos haven’t pleased everyone with many Man Utd fans fuming to see one thing that Sancho did.

The England international was filmed wearing the Dortmund training kit and just moments after returning to the club he was seen kissing the badge.

Fans were seething at the act with Sancho still on the books at Old Trafford and set to return after his loan expires in the summer.

One supporter said: “He never kissed the United badge like this.”

While another added: “What a traitor!”

A third wrote: “Kissing the badge on day one… that’s a violation!”7Sancho’s first actions back at Dortmund have left Manchester United fans reeling7The star kissed the badge in front of the camera at the Dortmund training ground

And a fourth chimed in writing: “Good riddance.”

Sancho was greeted by his former teammates with open arms on his return to the club.

And even former teammate Erling Haaland was pleased by the move as he posted a message of support on social media.

Sancho didn’t waste any time getting back into the action as he began training with the squad.

The tricky winger is expected to head to Marbella with the rest of the squad for their mid-season training camp before potentially making his debut this weekend.

He re-joins the club after previously making 137 appearances in which he scored 50 goals and registered an impressive 64 assists.

The Man Utd loanee will sport the number ten for the club citing his idol Ronaldinho as the reason he chose the new shirt number.

The star also seemingly took a swipe at Erik ten Hag during his first interview with the club when he told Dortmund fans that he: “can’t wait to play football with a smile”.

Sancho’s Red Devils contract runs until 2026 and his parent club are reportedly paying £100,000 of his weekly £290,000 salary while he is in Germany.

While Dortmund will pay United £3m for the loan, which could rise to £3.4m if clauses relating to appearances and Champions League qualification are met.

7Sancho returned to his old stomping ground to trainCredit: Getty7He re-joins Dormund after spending four seasons with the club from 2017 to 2021Credit: Getty7The 23-year-old’s deal does not include a buy option for DortmundCredit: Getty